How long did Elie Wiesel wait to write?

When Elie Wiesel was liberated from Buchenwald in 1945, having also been in Birkenau, Auschwitz, and Buna, he imposed a ten-year vow of silence upon himself before trying to describe what had happened to him and over six million other Jews. When he finally broke that silence, he had trouble finding a publisher. Such depressing subject matter.